Quadruple Alliance (1815)

The Quadruple Alliance was a four-nation alliance of the United Kingdom, the Austrian Empire, Prussia, and the Russian Empire that was formed in November 1815. The Quadruple Alliance was formed after the Holy Alliance allied with Britain, and the Quadruple Alliance decided to meet periodically to discuss issues of mutual concern and to resolve international issues by consultation and agreement. The alliance functioned until 1818.